TCD assessment of NVC responses to cognitive examination in HC Accepted Version.pdf (593.78 kB)
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Transcranial Doppler ultrasonography in the assessment of neurovascular coupling responses to cognitive examination in healthy controls: A feasibility study.

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journal contribution
posted on 24.08.2017, 12:31 by C. A. L. Williams, R. B. Panerai, T. G. Robinson, V. J. Haunton
BACKGROUND: We tested the hypothesis that paradigms from the Addenbrooke's Cognitive Examination (ACE-III), including those that had not been studied using TCD previously (novel) versus those which had been (established), would elicit changes in CBF velocity (CBFv). NEW METHOD: Healthy subjects were studied with bilateral transcranial Doppler (TCD), beat-to-beat blood pressure (Finapres), continuous electrocardiogram (ECG), and end-tidal CO2 (nasal capnography). After a 5-min baseline recording, cognitive tests of the ACE-III were presented to subjects, covering attention (SUB7, subtracting 7 from 100 sequentially), language (REP, repeating words and phrases), fluency (N-P, naming words), visuospatial (DRAW, clock-drawing), and memory (MEM, recalling name and address). An event marker noted question timing. RESULTS: Forty bilateral data sets were obtained (13 males, 37 right-hand dominant) with a median age of 31 years (IQR 22-52). Population normalized mean peak CBFv% in the dominant and non-dominant hemispheres, respectively, were: SUB7 (11.3±9.6%, 11.2±10.5%), N-P (12.7±11.7%, 11.5±12.0%), REP (12.9±11.7%, 11.6±11.6%), DRAW (13.3±11.7%, 13.2±15.4%) and MEM (13.2±10.3%, 12.0±10.1%). There was a significant difference between the dominant and non-dominant CBFv responses (p<0.008), but no difference between the amplitude of responses. COMPARISON WITH EXISTING METHODS: For established paradigms, our results are in excellent agreement to what has been found previously in the middle cerebral artery. CONCLUSIONS: Cognitive paradigms derived from the ACE-III led to significant lateralised changes in CBFv that were not distinct for novel paradigms. Further work is needed to assess the potential of paradigms to improve the interpretation of cognitive assessments in patients at risk of mild cognitive impairment.

Funding

CALW was chosen by the University of Leicester to be supported by the Association of Physicians. The sponsors did not have a direct role in the conduct of the research. TGR is a NIHR Senior Investigator.

History

Citation

Journal of Neuroscience Methods, 2017, 284, pp. 57-62

Author affiliation

/Organisation/COLLEGE OF MEDICINE, BIOLOGICAL SCIENCES AND PSYCHOLOGY/School of Medicine/Department of Cardiovascular Sciences

Version

AM (Accepted Manuscript)

Published in

Journal of Neuroscience Methods

Publisher

Elsevier

issn

0165-0270

eissn

1872-678X

Acceptance date

22/04/2017

Copyright date

2017

Available date

26/04/2018

Publisher version

http://www.sciencedirect.com/science/article/pii/S0165027017301127?via=ihub

Notes

The file associated with this record is under embargo until 12 months after publication, in accordance with the publisher's self-archiving policy. The full text may be available through the publisher links provided above.

Language

en